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Abstract

This letter reports the application of the scanning heating laser source technique to
detect microcracks that may be undetected by conventional methods. In the proposed approach, we
monitor changes in the transmitted surface acoustic waves (SAWs) as a heating source is scanned over
the crack. The experimental system for microcrack detection by a scanning heating laser source is
obtained by exploiting the strong dependence of the transmission efficiency of acoustic pulses on
the state of the contacts, whether open or closed, between the crack faces. Microcracks can be
detected successfully by confirming the heating position at the point of maximal improvement of the
transmission efficiency of the SAWs.

References

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